振动深松耕作对不同类型土壤水分特征曲线影响研究

发布时间：2018-05-28 11:18

本文选题：土壤水分特征曲线 + 振动深松　；参考：《灌溉排水学报》2017年05期

【摘要】：为了探讨振动深松耕作措施对不同类型土壤的水分特征曲线的影响,利用吸力平板仪和压力膜仪对黑龙江省5种典型土壤,即黑土、黑钙土、水稻土、苏打盐碱土、沙土进行了测定。得到振动深松区和对照区的原状土壤在脱湿过程中不同吸力下的土壤含水率,并利用van Genuchten数学模型对5种土壤的水分特征曲线的实测值进行数值拟合,对比研究了5种土壤水分特征曲线及模型拟合参数、土壤当量孔径、土壤水分有效性及比水容量的变化。结果表明,振动深松前后土壤水分特征曲线差异显著。同一吸力下,深松区土壤含水率高于对照区,振动深松显著提高了土壤的有效供水能力,其中效果最佳的是苏打盐碱土和黑土。振动深松通过改善土壤结构,调整了孔隙孔径的比例,进而提高了土体的有效供水能力。
[Abstract]:In order to study the effect of vibratory deep loosening tillage on water characteristic curves of different types of soils, five typical soils in Heilongjiang Province, namely black soil, calcareous soil, paddy soil and soda saline soil, were treated by suction plate instrument and pressure film instrument. Sand was determined. The soil moisture content of the undisturbed soil under different suction in the process of dehumidification was obtained in the vibratory deep loose area and the control area, and the measured values of the five soil moisture characteristic curves were fitted numerically by van Genuchten mathematical model. The changes of soil water characteristic curves and model fitting parameters, soil equivalent pore size, soil water availability and specific water capacity were compared and studied. The results showed that the difference of soil moisture characteristic curve was significant before and after deep vibration loosening. Under the same suction, the soil moisture content in the deep pine area was higher than that in the control area, and vibration deep loosening significantly improved the effective water supply capacity of the soil, among which the soda-alkali soil and the black soil had the best effect. By improving soil structure and adjusting the proportion of pore diameter, vibration deep loosening can improve the effective water supply capacity of soil.
【作者单位】：东北农业大学水利与建筑学院;黑龙江省水利科学研究院;
【基金】：“十二五”国家科技支撑计划项目(2012BAD08B05) 水利部948计划项目(201121)
【分类号】：S152.7

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